Understanding midsurface creation and trimming methods

You can use the Advanced Midsurface Tools and Advanced Trimming Tools in the Midsurface by Face Pairs dialog box to control how the software generates and trims the mid-sheets for each face pair.

Understanding the mid-sheet creation methods

Although the faces that belong to side 1 of a face pair determine the size, shape, and number of individual sheets in a given mid-sheet, the software uses a mid-sheet creation method to determine where to create the mid-sheet.

• Use Side 1 creates the mid-sheet directly on the faces of side 1 of the pair.

• Offset creates the mid-sheet by offsetting a face from side 1 of the pair.

• Cloud of Points creates the mid-sheet from a sampling of points that the software takes between sides 1 and 2. In general, this method is the most computationally expensive.

• Use Largest Face uses the face in side 1 that has the largest surface area as the mid-sheet.

• Standard creates the mid-sheet using the method that the software determines is most appropriate for the given face pair. For example:If the thickness in a face pair varies by more than 10%, the software uses the Cloud of Points method to create the mid-sheet.If side 1 of the pair contains multiple faces, the software uses the Offset method to create the mid-sheet.The software initially uses the Standard method to create the mid-sheets for all face pairs.

You can use the Face Pair List to modify the current mid-sheet creation method for a selected face pair. When you select a face pair in the list, the software disables the button for the current mid-sheet creation method for that pair. For example, if Cloud of Points is the current creation method, the software disables the Cloud of Points button:

Understanding the trimming options

The Advanced Trimming Tools options control how the software trims the mid-sheet for a selected face pair.

• Trim to Side 1 Faces trims the mid-sheet based on the bounds of the face or faces that comprise side 1 of the pair.

• Trim to Solid Body trims the mid-sheet based on the bounds of the associated solid body as well as against the neighboring mid-sheets.

• Standard Trimming is the default trimming method. This method trims the mid-sheet based on the bounds of the faces that comprise both side 1 and side 2 in the pair. Standard Trimming also trims the mid-sheet against the neighboring mid-sheets.Note: In general, the Standard Trimming method should provide good results for most face pairs. If you are not satisfied with the appearance of a mid-sheet, you should evaluate the face pair definition first before you modify the trimming method. In many cases, problems that appear to be related to trimming are really the result of improperly paired faces. For example, you could try using the Reverse Face Pair option to reverse the side 1 and side 2 designations in the pair.

How do I

Create a midsurface by face pairs

Modify the face pairs in an existing midsurface

Define a midsurface with the Offset method

Define a midsurface with the User Defined method

Insert a replacement mid-sheet into a face pair

Learn more

Creating midsurfaces before meshing

Selecting appropriate parts for midsurfacing

Creating a midsurface by pairing faces

Understanding face pair creation

Working with the Face Pair list

Controlling midsurface display

Creating a midsurface with the Offset method

Creating user-defined midsurfaces

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Understanding midsurface creation and trimming methods, Simcenter 3D 2021.1 Series

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